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Letters Patent No. 81,811, dated September 1, 1868.

IMPROVEMENT IN SAWS.

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A Beit known that LWARRN P. MILLR, of the city, county, and State of New York, have invented a new and useful Improvement on my Mode of Attaching Teeth to Saws,l the same as that for which Letters Patent were granted me, the undersigned, on the ninth day of October, in the year one thousand eight hundred andv sixty-six, and are numbered 58,664; and do hereby declare that the following is a full, clear, `and exact description of the construction and operation ofthe same, reference being had to the annexed drawings, making part of thisspecication, in which-f- Letter Arepresents a section of a saw-plate with two teeth` inserted.

i Figure No. 1 shows a tooth with the point turned down.

Figure No. 2 represents a tooth in the proper position for work.

Like letters refer tov like parts in the drawing.

Letter A, section cfa saw-plate.

Letters 6 b are teeth.

Letters ce,` square ends 'of the plate or shoulder-rests.

Letters d cl, s houlder of the teeth.

Letters cZ e, line ofthe teeth when in position.

Letters ff, points ofthe teeth.

Lettersf G show the V-edge ofthe socket.

Letters i, heel of'the teeth.

The object of -my invention is to provide a ready' means of adjusting insertible saw-teeth to a true circle or cutting-line in relation to the centre of the axis of the saw, and it consists in forming'a plane-faced shoulder upon the tooth which abuts against o. terminal rest upon the saw-plate above the recess that receives the shank of the tooth. y

The plane shoulder on the tooth can be filed, to elevate the tooth truly to the cutting-line, and, in case one or more teeth have by `any cause been reduced so that` the cutting-point is below or within the cutting-line, they can be `adjusted to their original position at the euttingline by simply filing the shoulder on the tooth, as above -stated,thi1sav.oidingtheieeessity oi' tiling oil the pointsrof the perfect teeth to correspond with those that may havepbeen reduced in their projection.

lTo enable others skilled in the art'to make and use my invention, I will proceed to describe its construction .l

and operation.

I construct a saw-tooth in the iorinvas shown in the drawing, the shank of which is round, and comprises more than a halt` of a circle. A il-groove 'is cut all around in the periphery of the shank, and terminatesiat the shoulder d. Said shoulder and the end of the/plate or rest c form a butt-joint.

Thesocket in the plate is formed to fit said tooth, with a V-edge, as shown at G.

I The tooth `is inserted into the socket in the manner as shown by the dotted lines on fig. No. 2. The point ofthe toothf lies on the side of the plate; the heel z'is placed within half the ircle as represented from c to hf the top of the tooth is then strucka light blow or two with a hammer, which will cause the tooth to settle d owir into the socket; a lever is next applied to the straight part of the tooth, and by which means it is turned linto the socket, and the projection d is brought in contact with the end of the plate or rest at c.

The manner of adjusting the teeth is as follows:

Whenever 'a tooth is rendered too short, from any cause,fturn the pointf down, as shown at fig. 1, so as to expose' the shoulder d, le away'a portion of it, then turn the tooth back into position, and the point will be projected to the cutting-line.

g I am aware that shoulders on insertible vsaw-teeth have been made in circular for-m,la'nd having 'either a V-shaped groeve therein, or a V-shaped tongue that ts in a'corresponding groove or tongue in the saw-plate. Such construction-I do not claim'as my invention, for in practice it is found that, in swaging the point of a tooth, that part having the groove in it will .splitand destroy the tooth vor damage the saw-plate. Nor will emu 2 such construction admit of the tiling away of the parts, tol adjust the point of the tooth to the cutting-line, as

can be done by-my construction.

The advantages that the square shoulder has over those formed on circular lines are` First, it forms a. more substantial backing to support the tooth, while, being upset with the swage at the point, the shoulder does not split and give way, as is the case when the shoulder is grooved.

Second, the shoulder being square, admits of being led so as to adjust the teeth in the manner described. What I claim as new, and desire to secure by Letters Patent, is 1. The shoulder d, ou tooth b,and rest c, on saw-plate A, when `constructed and arranged to operate in the manner. and for the purpose substantially as described.

2. A detachable sawatooth, in which is combineda circular shank adapted to a circular recess in the sarplate, and having shoulder d, adapted to abut against rest c, on the saw-plate, as described.

WARREN P. MILLER.

Witnesses:

JNO. S7 WooDwARD. DAVID M. EDsALL. 

